EP 1182769 A2 20020227 - Switching power supply circuit
Title (en)
Switching power supply circuit
Title (de)
Schaltnetzteilschaltkreis
Title (fr)
Circuit d'une alimentation de puissance à découpage
Publication
Application
Priority
JP 2000253012 A 20000816
Abstract (en)
In making constant a direct-current output voltage obtained by rectifying an alternating voltage generated in a secondary winding of an isolating converter transformer PIT, an active clamp circuit formed with an auxiliary switching device, a clamp capacitor, and a clamp diode is connected in parallel with a parallel resonant capacitor to be supplied with the alternating voltage, instead of using a three-terminal regulator and a chopper regulator, which step down and make constant the direct-current output voltage. A control circuit effects PWM control of the auxiliary switching device of the active clamp circuit and thereby equivalently changes capacitance of the parallel resonant capacitor. Thus, the direct-current output voltage is made constant, and power loss caused in making the direct-current output voltage constant is reduced. <IMAGE>
IPC 1-7
IPC 8 full level
H04N 3/18 (2006.01); H01F 38/42 (2006.01); H02M 3/28 (2006.01); H02M 3/335 (2006.01)
CPC (source: EP KR US)
H02M 3/28 (2013.01 - KR); H02M 3/33576 (2013.01 - EP US); H02M 1/009 (2021.05 - EP US); Y02B 70/10 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1182769 A2 20020227; EP 1182769 A3 20020925; CN 1338812 A 20020306; JP 2002064980 A 20020228; KR 20020014691 A 20020225; TW 529233 B 20030421; US 2002044469 A1 20020418; US 6456509 B1 20020924
DOCDB simple family (application)
EP 01306647 A 20010802; CN 01125593 A 20010816; JP 2000253012 A 20000816; KR 20010047167 A 20010804; TW 90119397 A 20010808; US 92592101 A 20010809